Capstan



(No Model.) 2 Sheets-S-heefl.

' D. N. B. OOPPIN.-

- Capstan. No 239 1 Patented March 22,1881.

flyl.

-Zivenfor; QMfi (5% MPETERS, PHDTCLUTHOGRAPHER, WASHINGTON, l) C UNITED STATES PATENT OFFICE.

DAVID N. B. OOFFIN, OF NEWTON, MASSACHUSETTS.

CAPSTAN.

SPECIFICATION forming part of Letters Patent No. 239,144, dated March 22 1881 Application filed June 24, 1880. (No model.)

To all whom it may concern:

Beit known that 1., DAVID N. B. OOFFIN, of the city of Newton, in the county of Middlesex and State of Massachusetts,have invented certain new and useful Improvements in Gapstans, of which the following is afull and exact supplementary set of outside pawls to so lock the parts as to accomplish the first-n amed purpose; to the improved construction of the pawls and their connection to the other parts; to the improved construction of the barrel, lever-head, and the severalparts and their combinations, substantially as hereinafter more fully set forth.

With reference to the drawings, Figure 1 is a sectional elevation of a capstanin which my improvements are incorporated. Fig. 2 is a plan of thedeck-plate and spindle. Fig.3 is a plan of the next member above the deckplate, having an intern al annular gear, a ratchet or tooth wheel to retain or be acted on by the supplementary pawls, and carrying the main set of pawls. Fig. 4is a plan of the upper barrel, side gears, side shafts, and supplementary. pawls. Fig. 5 is asimilar under view of same parts, but showinglower side gears 0 instead of upper side gears c. Fig. 6 is a plan of the lever-head. Fig. 7 is an under view of same. Fig. 8 is an elevation of one pawl. Fig. 9is a sectional plan of same and apart of the barrel, and the pin and wrist or hub to hold the pawl on and form its compound journal, and a smaller pin, split or otherwise, to retain the larger pin. Fig. 10 is a sectional elevation of the center or first moving gear actuated by the lever-head. Fig. 11 is an under view of same.

Fig. 12 is a plan of the small retainingcap for top of spindle. Fig. 13 is a plan of washer placed under it.

I Like letters refer to the same or corresponding parts in all the figures.

The capstan-barrel is marked a; its whelps b. It has one, two, or more side shafts, 0, turnin g in suitable bearings in the barrel. Each shaft 0 is provided with one gear keyed to its top end and onekeyed to its bottom end. The

barrel is also provided with an annular oil The whelps The set of pawls e, which, for a distinction, I

have called supplementary, as well as also the main pawls f, are peculiar, having an entire circular recess or box, to embrace a corresponding hub on the capstan, and also the usual pin, which by this means may be loose in both pawl and hub, the pin being kept in place by a smaller pin, split or otherwise, or by nut inside. The top of the barrel terminates below the upper gears, so as to make them more accessible when the lever-head is removed.

The deck-plate or base has an upper plate sloping outward to a rim, against which are set the ratchet-teeth or lugs for pawlsf to act These lugs are supported by the rim at the outer end; but the inner ends are clear, so the spaces between them maybe drained from common holes or hole g. The deck-plate has securely fitted to it the spindle h; or this spindle may be extended through it to drive or be The spindle is reduced The part shown in Fig.3, and marked 72., combines an internal gear, t, into which the gears on the lower ends of the side shafts, a, play, and the ratchet j, before alluded to. It also carries the main pawls f. This part turns about the spindle, supported by the hub of the base or deck-plate, except in some of the cases alluded to, when the spindleis extended below to turn in the deck-plate; then in some cases it will or may turn with the spindle. The

pawls f and the pawls 0 may be turned to work in either direction, for purposes hereinafter named.

The center gear, 70, has an upwardly-extendin g shank provided with clutch orfeather, upon which the lever-head freely fits. An important peculiarity of the lever-head is, that a finelyformed cap-plate, l, is combined with a series of lever-pockets or sleeves projecting partly above and partly below it, so as to bring the periphery of the cap-plate into availability as a central web extending around horizontally to unite and support them, producing a lighter head with less material and greater strength than any construction or combination hitherto used. The top of the central hub of the leverhead'jjs recessed, so that the oil introduced above shall find its way to the center spindlebearing and gear, and the cap at has a corresponding drooping part entering said recess and guiding the washer n. A pin, 0, is driven through the cap 102 and the spindle h, whereby it becomes the means of holding together all the parts of the capstan.

When it is desired to take the capstan apart the pin 0 is driven out. The cap at then comes freely off, next the lever-head 119, next the center gear, 7c, next the barrel a, with its side gears and shafts, next the internal or fulcrum gear,

j, its pawls f, 850., when all parts are accessible.

It will be noticed that the pawl-ratchets and the internal gear are drained perfectly from a common hole or holes, and do not require a drainage-hole between every lug, as is common.

Theparts may be made of cast-iron, wroughtiron, brass, &c., and the usual materials.

. The operation is as follows: The pawls e being thrown in the opposite direction from the position of pawls f on the part h, and the lever-head being turned in the direction against the upper pawls, the fast purchase is obtained. If then the pawls c be reversed, the power purchase is obtained. If then pawls f be reversed, the fast purchase is obtained in the 0pposite direction of revolution. If now pawls e be again reversed, the power purchase is obtained in the same direction. The simple or fast purchase by this method brings into use the elasticity of the side-shaft gearing as well as the power purchase.

I claim- 1. In a capstan having a center gear moved by the lever-head or thespindle and an internal gear connected by intermediate gearing, the combination of the outside pawls, e, on the barrel and the outside pawls, f, on the internal gear, substantially as shown and described.

2. The outside set of pawls, 6, when used to change the power by reversing them.

3. The outside set of pawls, f, when used to change the power by reversing them. 7

4. An outside set of pawls, 6, when used to lock the internal gear to the barrel.

5. The outside set of pawls, f, when jointed to the internal or fulcrum gear for looking it to the deck-plate, substantially as described.

6. The combination of gear 70, side shafts, c, with their gears, internal gear, 13, with pawls f, barrel, deck-plate, and lever-head, substantially as described.

7. The lever-head as constructed-viz., so that the cap-plate l connects the lever-pockets or sleeves at or near their central elevation, substantially as shown and described.

8. The arrangement of the upper side gears wholly above the barrel, so as to be wholly exposed and accessible when the lever-head is removed, substantially as shown,

9. The barrel as constructedviz., with whelps b terminating below thetop of the barrel against a zone of the barrel of equal radial height with the surface of the whelps.

10. The barrel as constructed-via, with the curved face of the whelps projecting radially beyond the barrel at bottom to extend the rope-guiding capacity of the barrel, substantially as shown.

11. The combination of the hub q and the pin .9 with the wholly-circular socket tin the pawl, substantially as shown.

12. The lever-head as constructed-via, with the lever-pockets or sleeves, projecting both above and below the cap-plate or body Z of the lever-head, substantially as shown.

13. The pawl-ratchet sockets, constructed to open inwardly to a common drainage-space or annular channel, substantially as shown and described.

14. In a power-capstan, the two sets of outside pawls, so applied as to interchangeably serve to pawl the barrel and by reversing to change the power, substantially as described.

D. N. B. OOFFIN.

Witnesses:

ALBERT W. OAsnY, IsAAo NEWTON Lnwrs. 

